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b in (-oo:+oo)
b+4 = 4*b+28 // - 4*b+28
b-(4*b)-28+4 = 0
b-4*b-28+4 = 0
-3*b-24 = 0 // + 24
-3*b = 24 // : -3
b = 24/(-3)
b = -8
b = -8
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